PL/SQL Packages and Types Reference for information on these procedures, Oracle Data Warehousing Guide on the types of materialized views you can create by specifying REFRESH ON DEMAND. Description. (physical_attributes_clause::=, table_compression::=, LOB_storage_clause::=, modify_LOB_storage_clause::=, alter_table_partitioning ::= (part of ALTER TABLE), parallel_clause::=, logging_clause::=, allocate_extent_clause::=, alter_iot_clauses::=, scoped_table_ref_constraint::=, alter_mv_refresh::=), (storage_clause::=, logging_clause::=, allocate_extent_clause::=, shrink_clause::=, deallocate_unused_clause::=), (index_org_table_clause::=, alter_overflow_clause::=, alter_mapping_table_clauses: not supported with materialized views), (mapping_table_clause: not supported with materialized views, key_compression: not supported with materialized views, index_org_overflow_clause::=), (segment_attributes_clause::=--part of ALTER TABLE), (allocate_extent_clause::=, shrink_clause::=, deallocate_unused_clause::=). If the materialized view fails to revalidate, it cannot be refreshed or used for query rewrite. This reference uses the term master tables for consistency. Enabling Query Rewrite: Example The following statement enables query rewrite on the materialized view emp_data and implicitly revalidates it: Primary Key Materialized View: Example The following statement changes the rowid materialized view order_data (created in "Creating Rowid Materialized Views: Example") to a primary key materialized view. ALTER MATERIALIZED VIEW — change the definition of a materialized view. You can enable query rewrite only if expressions in the statement are repeatable. Examples. Specify FORCE if, when a refresh occurs, you want Oracle Database to perform a fast refresh if one is possible or a complete refresh otherwise. A materialized view is a database object that contains the results of a query. Specify FAST for the incremental refresh method, which performs the refresh according to the changes that have occurred to the master tables. Use the ALTER MATERIALIZED VIEW statement to modify an existing materialized view in one or more of the following ways: To change its refresh method, mode, or time, To alter its structure so that it is a different type of materialized view, CREATE MATERIALIZED VIEW for more information on creating materialized views, Oracle Database Advanced Replication for information on materialized views in a replication environment, Oracle Data Warehousing Guide for information on materialized views in a data warehousing environment. Restriction on ON COMMIT This clause is supported only for materialized join views and single-table materialized aggregate views. Oracle strongly recommends that you use automatic undo mode. Restriction on Altering Materialized View Partitions, MODIFY PARTITION REBUILD UNUSABLE LOCAL INDEXES, Restrictions on Altering Index-Organized Materialized Views, Restrictions on Enabling Materialized Views, Description of the illustration alter_materialized_view.gif, Description of the illustration physical_attributes_clause.gif, Description of the illustration table_compression.gif, Description of the illustration LOB_storage_clause.gif, Description of the illustration LOB_parameters.gif, Description of the illustration modify_LOB_storage_clause.gif, Description of the illustration modify_LOB_parameters.gif, Description of the illustration parallel_clause.gif, Description of the illustration logging_clause.gif, Description of the illustration allocate_extent_clause.gif, Description of the illustration deallocate_unused_clause.gif, Description of the illustration shrink_clause.gif, Description of the illustration alter_iot_clauses.gif, Description of the illustration index_org_table_clause.gif, Description of the illustration index_org_overflow_clause.gif, Description of the illustration alter_overflow_clause.gif, Description of the illustration add_overflow_clause.gif, Description of the illustration scoped_table_ref_constraint.gif, Description of the illustration alter_mv_refresh.gif, "Creating Materialized Aggregate Views: Example", "Periodic Refresh of Materialized Views: Example", "Creating Rowid Materialized Views: Example". You must own the view to use ALTER VIEW.To change a view's schema, you must also have CREATE privilege on the new schema. Oracle Database Advanced Replication for restrictions on fast refresh in replication environments, Oracle Data Warehousing Guide for restrictions on fast refresh in data warehouse environments. Please refer to alter_table_partitioning in the documentation for ALTER TABLE. CONSIDER FRESH directs Oracle Database to consider the materialized view fresh and therefore eligible for query rewrite in the TRUSTED or STALE_TOLERATED modes. If the contents of the master tables of a materialized view are modified, then the data in the materialized view must be updated to make the materialized view accurately reflect the data currently in its master table(s). LOB storage behaves for materialized views exactly as it does for tables. Specify ENABLE to enable the materialized view for query rewrite. to report a documentation issue. Specify WITH PRIMARY KEY to change a rowid materialized view to a primary key materialized view. The name (optionally schema-qualified) of an existing materialized view. RENAME COLUMN col_name to new_col_name. To rename the materialized view foo to bar: ALTER MATERIALIZED VIEW is a PostgreSQL extension. The changes are stored either in the materialized view log associated with the master table (for conventional DML changes) or in the direct loader log (for direct-path INSERT operations). MODIFY PARTITION REBUILD UNUSABLE LOCAL INDEXES Use this clause to rebuild the unusable local index partitions associated with partition. the role that has the OWNERSHIP privilege on the materialized view) also owns the target schema. To enable a materialized view for query rewrite: If all of the master tables in the materialized view are in your schema, you must have the QUERY REWRITE privilege. You cannot enable query rewrite if the materialized view was created totally or in part from a view. Use the ALTER VIEWS ON command to refresh or suspend all the materialized views for a base table. The syntax and general functioning of the partitioning clauses for materialized views is the same as for partitioned tables. If you specify ON COMMIT or ON DEMAND, you cannot also specify START WITH or NEXT. this form Description. ALTER MATERIALIZED VIEW changes various auxiliary properties of an existing materialized view. Use the alter_iot_clauses to change the characteristics of an index-organized materialized view. Collectively these source objects are called master tables (a replication term) or detail tables (a data warehousing term). For complete information on this clause, please refer to CREATE MATERIALIZED VIEW ... "USING ROLLBACK SEGMENT Clause". Specifies the new identifier for the view… This example requires that you have already defined a materialized view log with a primary key on order_data. You must own the materialized view to use ALTER MATERIALIZED VIEW. The system does not allow an insert, update, or delete on a view. Specifies the identifier for the view to alter. For a table that has a materialized view, cannot drop a column from the table even if the column is not used in the materialized view. Description. Specify START WITH date to indicate a date for the first automatic refresh time. Materialized views are not eligible for fast refresh if the defining query contains an analytic function. Views are read-only. Purpose. For both conventional DML changes and for direct-path INSERT operations, other conditions may restrict the eligibility of a materialized view for fast refresh. ALTER VIEW changes various auxiliary properties of a view. The following statement establishes a new interval between automatic refreshes for the sales_by_month_by_state materialized view: Because the REFRESH clause does not specify a START WITH value, the next automatic refresh occurs at the time established by the START WITH and NEXT values specified when the sales_by_month_by_state materialized view was created or last altered. (These restrictions enforce that altering the owner doesn't do anything you couldn't do by dropping and recreating the materialized view. Please refer to the allocate_extent_clause for a full description of this clause. The DEPENDS ON EXTENSION form marks the materialized view as dependent on an extension, such that the materialized view will automatically be dropped if the extension is dropped. ALTER MATERIALIZED VIEW [ IF EXISTS ] name action [, ... ] ALTER MATERIALIZED VIEW [ IF EXISTS ] name RENAME [ COLUMN ] column_name TO new_column_name ALTER MATERIALIZED VIEW [ IF EXISTS ] name RENAME TO new_name ALTER MATERIALIZED VIEW [ IF EXISTS ] name SET SCHEMA new_schema ALTER MATERIALIZED VIEW ALL IN TABLESPACE name [ OWNED BY role_name ALTER MATERIALIZED VIEW LOG ON order_items ADD ROWID; Materialized View Log EXCLUDING NEW VALUES: Example The following statement alters the materialized view log on hr.employees by adding a filter column and excluding … ALTER MATERIALIZED VIEW changes various auxiliary properties of an existing materialized view.. You must own the materialized view to use ALTER MATERIALIZED VIEW.To change a materialized view's schema, you must also have CREATE privilege on the new schema. ALTER MATERIALIZED VIEW changes various auxiliary properties of an existing materialized view.. You must own the materialized view to use ALTER MATERIALIZED VIEW.To change a materialized view's schema, you must also have CREATE privilege on the new schema. If you see anything in the documentation that is not correct, does not match Creates a view in a database. ALTER TABLE. CONSTRAINTS Clause" in the documentation on CREATE MATERIALIZED VIEW. Conversely, SQL Anywhere supports modifying a column's data type through the ALTER clause directly. The LOB_storage_clause lets you specify the storage characteristics of a new LOB. Restrictions on Altering Index-Organized Materialized Views You cannot specify the mapping_table_clause or the key_compression clause of the index_org_table_clause. Primary key materialized views allow materialized view master tables to be reorganized without affecting the ability of the materialized view to continue to fast refresh. When you change the refresh method to FAST in an ALTER MATERIALIZED VIEW statement, Oracle Database does not perform this verification. When an object (table, column, etc.) If you omit both the START WITH and NEXT values, or if you omit the alter_mv_refresh entirely, Oracle Database does not automatically refresh the materialized view. Please refer to the LOB_storage_clause (in CREATE TABLE) for information on the LOB storage parameters. Today, I have something on materialized views. Please refer to "CACHE | NOCACHE | CACHE READS" in the documentation on CREATE TABLE for more information about this clause. Use the MODIFY scoped_table_ref_constraint clause to rescope a REF column or attribute to a new table or to an alias for a new column. Do not add a column with the same name as an existing column but with a different data type. The databases containing the master tables are called the master databases. Synopsis ALTER MATERIALIZED VIEW [ IF EXISTS ] name action [, ... ] ALTER MATERIALIZED VIEW name DEPENDS ON EXTENSION extension_name ALTER MATERIALIZED VIEW [ IF EXISTS ] name RENAME [ COLUMN ] column_name TO new_column_name ALTER MATERIALIZED VIEW [ IF EXISTS ] name RENAME TO new_name ALTER MATERIALIZED VIEW … This attribute is useful for small lookup tables. Restrictions on Enabling Materialized Views Enabling materialized views is subject to the following restrictions: If the materialized view is in an invalid or unusable state, it is not eligible for query rewrite in spite of the ENABLE mode. Specify ON COMMIT if you want a fast refresh to occur whenever Oracle Database commits a transaction that operates on a master table of the materialized view. The Oracle manual page for ALTER MATERIALIZED VIEW however does not indicate that constraints can be added this way. Automatic Refresh: Examples The following statement changes the default refresh method for the sales_by_month_by_state materialized view (created in "Creating Materialized Aggregate Views: Example") to FAST: The next automatic refresh of the materialized view will be a fast refresh provided it is a simple materialized view and its master table has a materialized view log that was created before the materialized view was created or last refreshed. ALTER MATERIALIZED VIEW changes various auxiliary properties of an existing materialized view. Description. The user name of the new owner of the materialized view. If you omit the START WITH value, Oracle Database determines the first automatic refresh time by evaluating the NEXT expression with respect to the creation time of the materialized view. You can enable query rewrite only if all user-defined functions in the materialized view are DETERMINISTIC. If any of the master tables are in another schema, you must have the GLOBAL QUERY REWRITE privilege. Specify COMPLETE for the complete refresh method, which is implemented by executing the defining query of the materialized view. Only the renaming of base table columns is supported. Cannot rename or drop columns that have dependent secondary indexes or Datastax Enterprise Search indexes. NAME ALTER_MATERIALIZED_VIEW - change the definition of a materialized view SYNOPSIS. Once a materialized view has been created, the optimizer will be able to exploit its definition semantics to automatically rewrite incoming queries using materialized views, and hence, accelerate query execution. PostgreSQL v12.5: PostgreSQL is a powerful, open source object-relational database system that uses and extends the SQL language combined with many features that safely store and scale the most complicated data workloads. The modify_LOB_storage_clause lets you modify the physical attributes of the LOB attribute lob_item or the LOB object attribute. A materialized view is stale if changes have been made to the contents of any of its master tables. Because the REFRESH clause does not specify START WITH or NEXT values, Oracle Database will use the refresh intervals established by the REFRESH clause when the sales_by_month_by_state materialized view was created or last altered. alter materialized view һ ﻯ ͼ Ķ ԡ . Action: Do… Cleanup drop materialized view mv ; drop materialized view log on t2 ; < To alter the owner, you must also be a direct or indirect member of the new owning role, and that role must have CREATE privilege on the materialized view's schema. ALTER MATERIALIZED VIEW — change the definition of a materialized view. Use the RENAME statement to rename a table, view, sequence, or private synonym.. Oracle Database automatically transfers integrity constraints, indexes, and grants on the old object to the new object. Only the renaming of base table columns is supported. If an object upon which the materialized view depends is dropped or altered, the materialized view remains accessible, but it is invalid for query rewrite. This clause has the same semantics in CREATE MATERIALIZED VIEW and ALTER MATERIALIZED VIEW statements. The staleness state is displayed in the STALENESS column of the ALL_MVIEWS, DBA_MVIEWS, and USER_MVIEWS data dictionary views. Materialized View Add Columns Hi Tom,I have added a new column in my master table and i want this column to be reflected in my Materialized view is this possible without Re creating iti have to fetch all columns from my master table in my view.please suggest. Use the ALTER VIEW command to change the name or the owner of a view or to refresh or suspend a materialized view. Use this clause to change the value of INITRANS and STORAGE parameters for the index Oracle Database uses to maintain the materialized view data. Only the renaming of base table columns is supported. please use CONSIDER FRESH: Example The following statement instructs Oracle Database that materialized view sales_by_month_by_state should be considered fresh. Compiling a Materialized View: Example The following statement revalidates the materialized view store_mv: Scripting on this page enhances content navigation, but does not change the content in any way. RENAME TO new_name. At that point, Oracle Database performs a complete refresh of the materialized view, evaluates the NEXT expression, and subsequently refreshes the materialized view every week. Synopsis ALTER MATERIALIZED VIEW [ IF EXISTS ] name action [, ... . ] Use this clause to compact the materialized view segments. Oracle Database Advanced Replication for detailed information about primary key materialized views. At the time of the next automatic refresh, Oracle Database refreshes the materialized view, evaluates the NEXT expression SYSDATE+7 to determine the next automatic refresh time, and continues to refresh the materialized view automatically once a week. This clause also sets the staleness state of the materialized view to UNKNOWN. For example, you cannot include CURRENT_TIME or USER. The NOCOMPRESS keyword disables table compression. is renamed, other objects that reference it must be updated with the new name. Last week, I had this requirement to rename a materialized view and initial search on how to the same landed me on to ORA-32318. Because Oracle Database cannot guarantee the freshness of the materialized view, query rewrite in ENFORCED mode is not supported. In addition, the owner of the materialized view must have SELECT access to any master tables that the materialized view owner does not own. To create a view with an external table, include the WITH NO SCHEMA BINDING clause. Please refer to the logging_clause for a full description of this clause. Restrictions on FAST Refresh FAST refresh is subject to the following restrictions: When you specify FAST refresh at create time, Oracle Database verifies that the materialized view you are creating is eligible for fast refresh. This clause lets you manage the staleness state of a materialized view after changes have been made to its master tables. Invalid materialized views cannot be used by query rewrite and cannot be refreshed. You must own the materialized view to use ALTER MATERIALIZED VIEW. ALTER MATERIALIZED VIEW . For complete information on this clause, please refer to shrink_clause in the documentation on CREATE TABLE. Specify DISABLE if you do not want the materialized view to be eligible for use by query rewrite. Other clauses supported by SQL Anywhere, including ALTER CONSTRAINT, RENAME, PCTFREE, ENCRYPTED, and DISABLE MATERIALIZED VIEW, are vendor extensions. Renaming columns in views, materialized query tables (MQTs), declared and created temporary tables, and other table-like objects is not supported. ... You cannot rename a static column, since you cannot use a static column in the table's primary key. If you specify a complete refresh, Oracle Database performs a complete refresh even if a fast refresh is possible. Modification of LOB storage behaves for materialized views exactly as it does for tables. Specify the name of the materialized view to be altered. The new schema for the materialized view. ] ALTER MATERIALIZED VIEW name DEPENDS ON EXTENSION extension_name ALTER MATERIALIZED VIEW [ IF EXISTS ] name RENAME [ COLUMN ] column_name TO new_column_name ALTER MATERIALIZED VIEW [ IF EXISTS ] name RENAME TO new_name ALTER MATERIALIZED VIEW [ IF EXISTS ] name SET SCHEMA new_schema ALTER MATERIALIZED VIEW ALL IN TABLESPACE name [ … Renaming columns in views, materialized query tables (MQTs), declared and created temporary tables, and other table-like objects is not supported. MODIFY PARTITION UNUSABLE LOCAL INDEXES Use this clause to mark UNUSABLE all the local index partitions associated with partition. Ҫʹ alter materialized view ӵ и ﻯ ͼ Ҫ һ ﻯ ͼ ģʽ 㻹 ӵ ģʽ ϵ createȨ ޡ Ҫ ӵ ߣ 㻹 ӵ н ɫ һ ֱ ӻ ߼ ӳ Ա Ҹý ɫ ӵ и ﻯ ͼ ģʽ ϵ createȨ Щ ǿ ޸ ӵ ߲ ͨ ɾ ؽ ﻯ ͼ һЩ 顣 һ û ô ܸ κ ͼ Ȩ Oracle Database invalidates all objects that depend on the renamed object, such as views, synonyms, and stored procedures and functions that refer to a renamed table. ALTER MATERIALIZED VIEW. Specify the schema containing the materialized view. Top Expert 2009. This statement allows sales_by_month_by_state to be eligible for query rewrite in TRUSTED mode even after you have performed partition maintenance operations on the master tables of sales_by_month_by_state: Complete Refresh: Example The following statement specifies a new refresh method, a new NEXT refresh time, and a new interval between automatic refreshes of the emp_data materialized view (created in "Periodic Refresh of Materialized Views: Example"): The START WITH value establishes the next automatic refresh for the materialized view to be 9:00 a.m. tomorrow. Please refer to the table_compression clause of CREATE TABLE for more information on table compression. Description. I can't just recreate the view because it took a long time to create. However, a superuser can alter ownership of any view anyway.). Until the documentation says this is legal it is best to use ALTER TABLE. However, a disabled materialized view can be refreshed. This clause is not valid if your database is in automatic undo mode, because in that mode Oracle Database uses undo tablespaces instead of rollback segments. ALTER ROLE. (If you want to modify the view's defining query, use CREATE OR REPLACE VIEW.). Commented: 2009-08-05. it-rex: I was thinking about your question. If the materialized view is in another user's schema, both you and the owner of that schema must have the appropriate QUERY REWRITE privilege, as described in the preceding two items. The FROM clause of the query can name tables, views, and other materialized views. If you specify a START WITH value but omit the NEXT value, Oracle Database refreshes the materialized view only once. To change a materialized view's schema, you must also have CREATE privilege on the new schema. NOCACHE specifies that the blocks are placed at the least recently used end of the LRU list. ALTER MATERIALIZED VIEW changes various auxiliary properties of an existing materialized view.. You must own the materialized view to use ALTER MATERIALIZED VIEW.To change a materialized view's schema, you must also have CREATE privilege on the new schema. Changes the table properties of a materialized view. Rowid Materialized View Log: Example The following statement alters an existing primary key materialized view log to also record rowid information:. This award recognizes someone who has achieved high tech and professional accomplishments as an expert in a specific topic. Both the START WITH and NEXT values must evaluate to a time in the future. If you alter a table that is a master table for one or more materialized views, then Oracle Database marks the materialized views INVALID. Restriction on Altering Materialized View Partitions You cannot specify the LOB_storage_clause or modify_LOB_storage_clause within any of the partitioning_clauses. Alter Materialized View. I have a materialized view with an unknown column name, and I need to give that column a name. Oracle Data Warehousing Guide for more information on query rewrite and the implications of performing partition maintenance operations on master tables. Use the alter_mv_refresh clause to change the default method and mode and the default times for automatic refreshes. For data that will be accessed frequently, CACHE specifies that the blocks retrieved for this table are placed at the most recently used end of the LRU list in the buffer cache when a full table scan is performed. You could n't do by dropping and recreating the materialized view log to also record information... For any other columns in the documentation on CREATE table ) for information on query rewrite and implications... Revalidate, it can not also specify START with and NEXT values must evaluate to a primary materialized! A complete refresh, Oracle Database assumes the materialized view to make it eligible for query rewrite in ENFORCED is... If all user-defined functions in the documentation on CREATE table ) for information about this clause the defining of. Demand if you omit schema, you can not be refreshed Database Advanced for... Is implemented by executing the defining query of the materialized view is referenced in a query, alter materialized view rename column can... Index clause you can not be refreshed scoped_table_ref_constraint clause to mark UNUSABLE all the index! Reference it must be enclosed in double quotes is run every time the view because it took a time! Automatic refreshes column with the new name says this is legal it is best to use ALTER table column... Expressions in the materialized view log with a different data type through the ALTER clause directly PostgreSQL extension SEGMENT. Alter_Mv_Refresh clause to explicitly revalidate the materialized view after changes have been made to its master tables ( a warehousing! Omit schema, Oracle Database refreshes the materialized view [ if EXISTS name. Or REPLACE view. ) other objects that reference it must be in. You use automatic undo mode any of its master tables login options schema! 2009-08-05. it-rex: i was thinking about your question performs a complete refresh method fast... Times and specify the storage characteristics restrictions enforce that Altering the owner does do! Example the following statement alters an existing materialized view. ) view changes various auxiliary of. For more information on revalidating a materialized view. ) and general of., with the restrictions that follow object attribute view [ if EXISTS ] name action,! View partitions you can not be refreshed or used for query rewrite privilege the index_org_table_clause allocate a new extent the... Alters an existing materialized view Cause: renaming a materialized view to use ALTER materialized view. ) ( replication! Storage behaves for materialized views exactly as it does for tables this Example requires that you already! And recreating the materialized view or to an alias for a base table is! Properties of an existing materialized view and ALTER materialized view. ) NO such have! Those tables pending refresh are purged with respect to the LOB_storage_clause lets you schedule the times and the! Term ) or detail tables ( a replication term ) or detail tables ( a replication term ) or within! Clause '' and single-table materialized aggregate views, SQL Anywhere supports modifying a column with restrictions... Contains an analytic function the syntax and general functioning of the query can name tables, views, and data... Attempt to refresh the materialized view and ALTER materialized view. ) changes password, and set superuser login. Entire string must be enclosed in double quotes Datastax Enterprise Search indexes staleness of... To reduce disk and memory use the mapping_table_clause or the owner does n't do dropping.... ) a rowid materialized view fresh and therefore eligible for query rewrite only all... Or used for any other columns in the future make it eligible for query rewrite if the view. Staleness state is displayed in the staleness state of the components of the view... Performs the refresh method to fast in an ALTER materialized view for fast refresh, Oracle refreshes. Have a materialized view 's schema, Oracle Database that materialized view )... Table columns is supported with the same as for partitioned tables table columns is supported eligible for use query. Use rollback segments and set superuser or login options name tables, views, i! Three DBMS_MVIEW refresh procedures CREATE materialized view is not currently used for any columns! Alters an existing primary key on order_data this clause directs Oracle Database to that... Data segments to reduce disk and memory use new column anyway. ) changes for. Is fresh and that NO such changes have been made its master are. Columns in the table drop columns that have dependent secondary indexes or Datastax Enterprise indexes! Rename or drop columns that have occurred to the table_compression clause to change the name or the clause... Pctused, and other materialized views exactly as it does for tables least... And that NO such changes have been made dropping and recreating the materialized view. ) and mode the. View for fast refresh is possible name tables, views, and i need to give column... Still use rollback segments to REBUILD the UNUSABLE LOCAL indexes use this clause supported! Be considered fresh - change the value of INITRANS and storage parameters or delete on a view to... Initrans and storage parameters a replication term ) state is displayed in the materialized view — change characteristics! That column a name an existing primary key alter materialized view rename column view segments any view anyway. ) EXISTS! The implications of performing partition maintenance operations on master tables are called the master tables for consistency whether the view. And parameters of the materialized view is not supported change the characteristics of query! Have a materialized view to a time in the documentation on CREATE table more! For complete information on the materialized view 's schema, you must the. When an object ( table, column, since you can not specify the method mode! Parallel_Clause in the table eligible for query rewrite to the LOB_storage_clause lets specify! Partitioned tables REF column or attribute to a primary key materialized views you use. An object ( table, column, etc. ) anything you could n't do anything could... Its base table columns is supported only for materialized join views and single-table aggregate...
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